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Python program to find sum of all digits of a number

Here, we are going to learn how to find the sum of all digits of a given number in Python programming language. By IncludeHelp Last updated : January 12, 2024

Problem statement

Write a Python program to find sum of all digits of a number.

Example

Consider the below example with sample inputs and outputs:

Input number:
0
Sum of all digits:
0

Input number:
12345
Sum of all digits:
15

Input number:
5678379
Sum of all digits:
45

Finding sum of all digits of a number

To find the sum of digits of a number, write a recursive function, extract the digits by dividing the numbers by 10 and convert it into int using the int() method and then find the floor division (//) by 10. Add the extracted digits. Repeat these steps till the floor division is not 0.

Python program to find sum of all digits of a number

# Python program to find the 
# sum of all digits of a number

# function definition
def sumDigits(num):
  if num == 0:
    return 0
  else:
    return num % 10 + sumDigits(int(num / 10))

# main code
x = 0
print("Number: ", x)
print("Sum of digits: ", sumDigits(x))
print()

x = 12345
print("Number: ", x)
print("Sum of digits: ", sumDigits(x))
print()

x = 5678379
print("Number: ", x)
print("Sum of digits: ", sumDigits(x))
print()

Output

The output of the above program is:

Number:  0
Sum of digits:  0

Number:  12345
Sum of digits:  15

Number:  5678379
Sum of digits:  45

To understand the above program, you should have the basic knowledge of the following Python topics: